EP0984251A2 - Wägezelle mit Buckelsensorscheibe für eine Auswägeeinrichtung von elektrischen Wägeanalagen - Google Patents

Wägezelle mit Buckelsensorscheibe für eine Auswägeeinrichtung von elektrischen Wägeanalagen Download PDF

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Publication number
EP0984251A2
EP0984251A2 EP99410107A EP99410107A EP0984251A2 EP 0984251 A2 EP0984251 A2 EP 0984251A2 EP 99410107 A EP99410107 A EP 99410107A EP 99410107 A EP99410107 A EP 99410107A EP 0984251 A2 EP0984251 A2 EP 0984251A2
Authority
EP
European Patent Office
Prior art keywords
load
sensor plate
strut
flexure
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99410107A
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English (en)
French (fr)
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EP0984251A3 (de
EP0984251B1 (de
Inventor
Chris Gross
Damon Germanton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Measurement Specialties Inc
Original Assignee
Measurement Specialties Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Measurement Specialties Inc filed Critical Measurement Specialties Inc
Publication of EP0984251A2 publication Critical patent/EP0984251A2/de
Publication of EP0984251A3 publication Critical patent/EP0984251A3/de
Application granted granted Critical
Publication of EP0984251B1 publication Critical patent/EP0984251B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing

Definitions

  • This invention relates generally to electronic type platform weighing systems, and more particularly to an improved load cell and sensor plate for use in an electronic weighing scale.
  • One popular type of electronic weighing scale is constructed with a platform for receiving the load to be weighed and a set of levers, pivots, flexures, and torque tubes to mechanically combine the forces applied to the platform by the load, thereby enabling the measurement of these forces with a single electronic load cell.
  • the load cell is typically constructed with a mechanically-deformable sensor plate which operates as a force transducer.
  • the sensor plate has bonded thereto one or more sensor elements that serve to convert the mechanical bending forces of the sensor plate into electrical signals. When a load is applied to such a load cell, the sensor elements bonded to the sensor plate produce electrical signals which are proportional to the load applied to the load cell.
  • Another popular type of electronic weighing scale is constructed with a platform which is supported by several electronic load cells which each produce an output signal.
  • the output signals of the load cells are electrically averaged to enable forces to be measured over a large area of the platform.
  • the sensor plate disclosed therein is constructed with a rigid force input section, a rigid force output section, and an intermediate force moment carrying section coupled between the force input and output sections.
  • the sections are interconnected by four horizontal flexural elements, four vertical flexural elements, a pair of force measuring members, and a pair of connecting structures.
  • This design allows forces to be measured along a first axis of the sensor plate and also moments about a second axis of the sensor plate which is perpendicular to the first axis.
  • the rather tall profile of this sensor plate design undesirably imposes minimum thickness requirements on the weighing scales.
  • the sensor plate of Kastel is fabricated from an areal spring material and is provided with a force introducing section, a clamping section, and an intcrmediate section connected to the force introducing section and the clamping section by flexural webs which are equipped with sensor elements.
  • prior art systems also utilize sensor plates having surfaces which have corregated or slotted rather than flat planar surfaces. This causes significant problems in attachment of electronic wires and/or electronic devices to the plate. Still further, numerous problems exist in the prior art regarding off-axis application of a load to the sensor plate. Such misalignment causes calibration and/or weight calculation errors, thus minimizing the accuracy of the scale.
  • It is an object of the present invention to provide a sensor plate for use in a load cell for use in an electronic scale comprising a planar first surface; a planar second surface opposite the first surface having a depression formed therein defining a flexure area; a load cavity formed in the second surface having a conical receptacle end for receiving a strut; and sensor means disposed over the flexure area for generating a signal is response to a load applied to the loading cavity wherein the strut has a first projection end coupled to the conical end of the loading cavity and a second end coupled to a footer member such that the strut mechanically floats therebetween for providing the applied load at a substantially central position at the load cavity.
  • Figure 1A is a top plan view of an embodiment of the bossed diaphragm sensor plate of the present invention.
  • Figure 1B is a cross-sectional view of the sensor plate shown in Figure 1A.
  • Figure 1C is a cross sectional view of the sensor plate showing tension and compression sections associated with the flexure area.
  • Figure 2A represents a partial cross-section associated with one side of the bossed diaphragm load cell having a floating conical strut according to an embodiment of the present invention.
  • Figure 2B represents a partial cross-section associated with one side of the bossed diaphragm load cell having a fixed conical strut according to an alternative embodiment of the present invention.
  • Figure 3 is a schematic circuit diagram which depicts how the strain gauges of the sensor plate are coupled.
  • Figure 4 is a view of the biasing element shown in Figure 2.
  • Figure 5 is a perspective view of a load cell comprising sensor plate, reinforcement member and strut according to the present invention.
  • Figure 6 is a plan view of a second surface associated with the sensor plate having an annular depression and conical cavity formed therein according to the present invention.
  • Figure 7 is a perspective view illustrating each of the major elements used in assembling the load cell according to the present invention for use in an electronic weighing scale.
  • Figure 8 is a perspective view of an electrical weighing scale employing load cells equipped with the bossed diaphragm sensor plate according to the present invention.
  • Figure 9A-B represent a partial cross sectional view and a top view respectively of the bossed diaphragm sensor plate and backing plate assembly according to the embodiment illustrated in Figure 2B.
  • a load cell sensor plate 10 according to an embodiment of the present invention is shown.
  • the sensor plate 10 is fabricated from sheet metal in a substantially flat rectangular configuration, which allows the sensor plate to be used in low profile load cell designs.
  • the unitary design of the sensor plate 10 provides substantially reliable performance and enables the sensor plate to be simply and economically manufactured.
  • Figure 1A shows a first planar surface 20, a bossed sensor plate 10 on which is disposed sensor means comprising strain gauges 1 - 4 interconnected in a circuit configuration as identified in Figure 3.
  • surface 20 is substantially planar and includes bonding pads 30 and 40 disposed respectively between strain gauges 1, 2, and 3, 4.
  • the flat planar surface 20 facilitates electrical interconnection between the sensors formed on the surface 20 and the remainder of the electronic circuitry housed within the electrical weighing scale via circuit 35 and electronic connector 36 as shown in Figures 5 and 8.
  • the sensors are disposed over a thinned surface area of the bossed sensor plate defined as a flexure area in order to sense bending moments resulting from an applied load or force.
  • the sensor plate 10 comprises a boss diaphragm structure having a flexure area which, in the preferred embodiment, is substantially annular and is illustrated in Figure 1B by first and second flexure portions 24 and 30 defined in the sensor plate.
  • the flexure portions or beams are defined in the sensor plate between apertures or slots 16, 18.
  • Mounting sections 12 and 14 enable the sensor plate 10 to either rest or be anchored within the interior of a load cell as illustrated in Figure 2 (reference numerals 12A, 14A).
  • the flexure area 25 has a uniform thickness t less than the overall thickness T of the sensor plate.
  • flexure area is between 5 and 8 times less than the overall thickness T of the sensor plate thus allowing for appropriate flexing and sensing of the force applied to the load cell.
  • the sensor pairs are preferably placed directly opposite one another as illustrated in Figure 1A and Figure 9B to provide an equalized sensing of the applied force impacting the load cell.
  • sensor plate 10 further includes cavity 22 for receiving a conical shaped projection for concentrating an applied load to the load cell.
  • Cavity 22 comprises substantially circular side walls 23 terminating in a conical shaped end portion 22A.
  • Cavity 22 has a diameter d of sufficient size to receive a strut 43 (see Figures 2A-B) having a conical shaped projection 44 which engages the cavity at substantially the point p at the center of the cone along the designated Y-axis.
  • the conical projection 44 from strut 43 inserted into cavity 22 functions to concentrate an applied load to the boss diaphragm structure plate 10 which generates a bending moment applied to the flexure portions 24 and 30.
  • the first flexure portion 24 includes a compression section 26 and a tension section 28.
  • the line of demarcation between the compression and tension section 26, 28 is shown by dotted line L1.
  • second flexure beam 30 includes compression section 32 and tension section 34, which are shown separated by dotted line L2.
  • the first flexure portion 24 includes the strain gauge 1 bonded to the surface of its compression section 26 and the strain gauge 2 bonded to the surface of the tension section 28.
  • second flexure portion 30 includes strain gauge 3 bonded to the surface of its compression section 32 and strain gauge 4 bonded to the surface of its tension section 34.
  • the strain gauges preferably consist of piezo-resistor sensing elements.
  • Figure 1C illustrates the operation of the tension and compression sections of flexure 30 in response to a load.
  • Figure 3 shows the electrical interconnection of the strain gauges 1-4 for equalizing the forces sensed by the strain gauges.
  • Cross coupling is accomplished by electrically coupling the strain gauges of the first flexure beam in series with those of the second flexure beam to form the bridge structure 36 depicted in Figure 3.
  • This circuit structure will supply an output signal which will very accurately characterize the total load applied to cavity 22 of the sensor plate 10.
  • the sensor plate of the present invention is not limited to the strain gauge arrangement described above. Accordingly, other well known sensor arrangements may be employed in the bossed diaphragm sensor plate of the present invention if desired.
  • FIG. 2A depicts a cross-sectional view of a boss diaphragm sensor plate 10 of the present invention as it is used in the low profile load cell designated by numeral 50.
  • a load cell 50 comprises a housing 51 which contains the boss diaphragm sensor plate 10, and a spiral positioner biasing element 72.
  • a strut member 43 having a substantially circular cross section and oppositely disposed conical shaped ends 44 and 45 operates to apply a load to the bossed sensor plate 10.
  • Conical projection 45 of strut 43 engages reinforcement member 86 having a substantially flanged portion 87 which rests upon element 72.
  • Conical grooved portion 92 of reinforcement member 86 is adapted to receive conical end 45 in such a manner as to allow strut 43 to mechanically "float" between member 86 and sensor plate 10. That is, for any twist or rotation resulting from a force applied resulting from an off axis force applied to the load cell, floating strut 43 operates to direct the load to center point p along the y-axis so that the load cell is self correcting, and thus operates to evenly distribute the applied force. Absent such a floating structure, off-center loading would result in off-axis forces detected by the sensor arrangement and factored into the weighing calculation resulting in erroneous or inaccurate weight readings.
  • the load cell arrangement comprising the boss diaphragm sensor plate 10, strut 43, and reinforcement member 86 combine to self-correct for any off-center loading that may occur as a result of twisting, rotation, or uneven surfaces associated with the angular position of the foot rest for each load cell.
  • the boss diaphragm design allows for low cost manufacture of the load cell by requiring only a milling operation to be performed in order to generate a load cavity and associated flexure area.
  • the planar design facilitates electrical interconnection on the top surface of the load cell to achieve a low cost and highly accurate product. As one can ascertain from Figure 2A, strain gauges 1 and 2 are disposed over flexure portion 24 of the overall flexure area 25 while sensors 3 and 4 are disposed flexure portion 30 for sensing and/or compression resulting from the applied load.
  • the load cell 50 includes strut 43 fixedly position within member 86 at one end and conically engaging lower cavity 22 via projection 44. Note that when referring to the drawings, and in particular to Figures 2A and 2B, like parts are indicated by like reference numerals.
  • the embodiment shown in Figure 2B further includes flexible backing plate 55 having arm portions 57 which support and engage bossed diaphragm sensor plate 10 that mounting sections 12 and 14 (and at 12A and 14A).
  • FIGS. 9A and B illustrate more detailed cross-sectional and top views respectively of the embodiment shown in Figure 2B including the bossed diaphragm sensor plate 10 and backing plate 55.
  • hole 58 is provided in backing plate 55 to allow for electronic wires or interconnections between the sensors of the load cell for communication with other load cells and with the remainder of the weighing scale.
  • the backing plate is disposed in a circular configuration over the mounting sections 12 and 14 (element 59) so as not to impact on the flexure area 25.
  • the backing plate is preferably made of a lightweight material such as a plastic having a circular top configuration 59 and having square-like arms 57 which enable the backing plate to fit snugly around the metal bossed diaphragm.
  • the backing plate disposed on the bossed diaphragm within housing 51 is fixed in the Y-axis for direction but maintains degrees of freedom within the X and Z (out of the page) planes to permit lateral movement in order to maintain the strut in substantially the center of the bossed diaphragm.
  • reinforcement member 86 comprises a hardened steel insert.
  • the hardened steel reinforcement member 86 is disposed within an aperture 100 of foot cell 84 extends out from the top of foot 84. Gripping surfaces 94 engage the inner walls of load cell 84 to prevent inadvertent removal of member 86.
  • Biasing element 72 as shown in Figures 2 and 4, has a rectangular shaped outer frame 74 having width and length dimensions substantially similar to sensor plate 10 width and length dimensions, includes an annular member 78 which is coupled to the frame 74 by a plurality of resilient, spiral-shaped arm members 80. Biasing element 72 also ensures that conically grooved surface 92 (Fig. 2A) of reinforcement member 86 is engaged with projection 45 on strut 43.
  • the flanged portion 87 of member 86 fits within annular member 78 of spiral bias element 72, resting on lip 73 (see Figure 4) such that a top surface of member 86 is planar with annular surface 78A.
  • Pad 110 fits within the cavity 85 of foot member 84 in order to provide a solid and stable base.
  • operation of the load cell is as follows.
  • a load is applied to the load cell 50 via the foot 84 which engages reinforcement member 86 causing projection 44 on strut 43 to be applied to portion 22A of cavity 22 resulting in deflection which causes the flexure beams 24, 30 of the sensor plate to bend.
  • the bending forces are sensed by the strain gauges 1, 2, 3, and 4 which generate an electrical signal that is indicative of the load applied to cavity 22 of the boss diaphragm sensor plate 10.
  • the boss diaphragm plate 10 of the present invention allows the load cell 50 to be constructed with a very low profile, since the present invention sensor plate provides both load support and load measurement in a single planar member which enables the load cell 50 to be employed in many different applications involving the measurement of weight.
  • the load cell may also be provided with a conventional power switch means (not shown) of well-known types capable of powering up or powering down an electronic weighing scale.
  • sensor plate 10 is substantially square with a substantially planar first surface 20 and second surface 12 opposite first surface 20 on which is formed an annular depression 18 which defines a flexure area on which are disposed sensor means comprising strain gauges 1, 2, and 3, 4 such that the flexure beams 24 and 30 are formed as illustrated in Figure 1B.
  • Circular cavity 22 is formed in substantially the center of the plate such that a substantially cylindrical projection 21 having cavity 22 disposed therein, is formed. The projection is coplanar with the remaining flat portion of surface 12 as illustrated in Figure 5.
  • Cavity 22 as previously mentioned, included conical shaped end 22A ( Figures 1B, 2A-B) for receiving similarly shaped strut 43 floatingly disposed therein.
  • the other end of strut 43 floatingly engages conical shaped cavity 92 of reinforcement member 86 which is retained in foot cell member 84 and which engages spiral bias member 72 (not shown).
  • the other end of strut 43 may fixedly engage foot 84 via reinforcement member 86 such that the strut remains in a fixed location at one end.
  • a backplate (not shown) is adapted to snuggly fit around the outer surface and mounting portions of sensor plate 10 and operative to move laterally in consonance with the bossed diaphragm sensor plate for maintaining engagement of the conical strut at a substantially center position within the plate in response to off-axis forces.
  • the first surface 20 of plate member 10 is protected by housing 51 which serves also to secure the device within the scale.
  • Figure 7 is a perspective view of each of the major elements for assembling the load cell of the present invention for use in a transparent weighing scale 115 having a glass platform 118.
  • FIG 8 there is shown an electronic weighing scale 115 which employs the load cell 50 of the present invention.
  • the scale 100 comprises a platform 102 supported in each corner by a load cell 50 constructed as described earlier.
  • the scale 100 also includes a display assembly 104 which is electrically coupled to the sensing arrangement of each sensor plate contained in the load cells 50 via wiring 106.
  • the load cells may or may not include the power switch means discussed previously.
  • the load When a load is placed on the platform 102, the load is distributed among the four load cells 50, such that each strain sensing arrangement of each load cell's sensor plate 10 generates an electrical signal which is proportional to the load on the load cell 50.
  • the four signals generated by the load cells 50 are transmitted by the wiring 106 to the display assembly 104 which has electrical circuitry that combines the four signals into a single analog signal which is proportional to the sum of the loads on the four individual lead cells 50.
  • the display assembly 104 also includes an amplifier (not shown) that amplifies the combined analog signal, and an analog-to-digital converter (not shown) which translates the analog signal to a digital signal.
  • Additional well known circuitry in the display assembly 104 transforms the digital signal into a reading in pounds or the like which is digitally displayed on the display screen 108 of the display assembly 104.
  • the electrical circuitry contained in the display assembly 104 is well known in the art and an example of such circuitry can be found in the copending U.S. Patent Application Serial No. 08/3 85,349, incorporated herein by reference.
  • the backing plate 55 illustrated in Figure 2B may also be contemplated as part of the dual-coned floating strut depicted in the embodiment of Figure 2A.
  • the thickness t of a flexure member is between 5 and 8 times less than the overall thickness T of the plate, other relative dimensions may also be utilized according to particular applications and requirements. Any and all such variations or modifications, as well as others which may become apparent to those skilled in the art, are intended to be included within the scope of the invention as defined by the appended claims.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Force In General (AREA)
EP99410107A 1998-09-03 1999-09-02 Wägezelle mit Buckelsensorscheibe für eine Auswägeeinrichtung von elektrischen Wägeanalagen Expired - Lifetime EP0984251B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US146890 1998-09-03
US09/146,890 US6417466B2 (en) 1998-09-03 1998-09-03 Load cell with bossed sensor plate for an electrical weighing scale

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EP0984251A2 true EP0984251A2 (de) 2000-03-08
EP0984251A3 EP0984251A3 (de) 2001-04-11
EP0984251B1 EP0984251B1 (de) 2004-03-03

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EP (1) EP0984251B1 (de)
DE (1) DE69915192T2 (de)

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EP1340968A1 (de) * 2002-02-27 2003-09-03 S.C.A.I.M.E. S.A. Biegekraftaufnehmer und hiermit versehene Wägevorrichtung
WO2008009794A1 (fr) * 2006-07-18 2008-01-24 Seb S.A. Appareil électronique de pesée
CN102322999A (zh) * 2010-05-11 2012-01-18 桑德克斯有线有限公司 用于井下负载测量工具的测力计
EP1423666B1 (de) * 2001-08-06 2016-04-27 Measurement Ltd. Waage mit niveaukompensationsfussbaugruppe
FR3047144A1 (fr) * 2016-01-28 2017-08-04 Bee Angels Dispositif de controle d’au moins un parametre d’une ruche tel que le poids et une ruche comprenant un tel dispositif de controle
WO2017177189A1 (en) * 2016-04-08 2017-10-12 Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The Uniiversity Of Nevada, Reno Systems and methods for determining snowpack characteristics
EP4174457A1 (de) * 2022-08-30 2023-05-03 Withings Wiegesystem mit teppichpolstern

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WO2004059264A1 (en) * 2002-11-14 2004-07-15 Measurement Specialties, Inc. Weighing scale adapted for allowing a user to find an optimal weighing position on the scale
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US7737372B2 (en) * 2007-06-13 2010-06-15 Scaletron Industries, Ltd. Leak and spill containment scale
FR2920535B1 (fr) * 2007-08-30 2009-11-27 Hill Rom Ind Sa Capteur de detection et de mesure de pressions incorporant au moins une cellule resistive de detection de forces
JP5097562B2 (ja) * 2008-01-17 2012-12-12 株式会社タニタ 電子重量計
FR2946427B1 (fr) * 2009-06-05 2011-09-30 Hill Rom Ind Sa Capteur de pression comprenant une cellule capacitive et dispositif de support en comportant.
US10591373B2 (en) * 2013-08-01 2020-03-17 Mts Systems Corporation Load transducer having a biasing assembly
US9778122B2 (en) 2013-08-01 2017-10-03 Mts Systems Corporation Two-axis sensor body for a load transducer
US9366588B2 (en) 2013-12-16 2016-06-14 Lifescan, Inc. Devices, systems and methods to determine area sensor
EP3001157B1 (de) * 2014-09-24 2020-04-22 Mettler-Toledo (Albstadt) GmbH Verbindungsportanordnung in einer elektronischen Vorrichtung
DE102016117539B4 (de) 2016-09-16 2024-02-22 Minebea lntec Bovenden GmbH & Co. KG Waage mit einer Wägeplattform
US11428589B2 (en) * 2017-10-16 2022-08-30 Saf-Holland, Inc. Displacement sensor utilizing ronchi grating interference
EP3671141B1 (de) * 2018-12-20 2022-08-03 Bizerba SE & Co. KG Wägezelle und wiegefuss
US10816419B2 (en) 2019-01-25 2020-10-27 FUTEK Advanced Sensor Technology Tripedal flexure member and load/torque measurement systems using same
US11528897B1 (en) * 2019-06-19 2022-12-20 BlueBite Tension measuring system that determine tension on a fishing line
CN110260960B (zh) * 2019-07-19 2023-11-24 江苏宗申车业有限公司 一种随车稳定安装防碰撞的电子行车称

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1423666B1 (de) * 2001-08-06 2016-04-27 Measurement Ltd. Waage mit niveaukompensationsfussbaugruppe
EP1340968A1 (de) * 2002-02-27 2003-09-03 S.C.A.I.M.E. S.A. Biegekraftaufnehmer und hiermit versehene Wägevorrichtung
US6828515B2 (en) 2002-02-27 2004-12-07 S.C.A.I.M.E. S.A. Proof body and weighing apparatus provided with such proof bodies
WO2008009794A1 (fr) * 2006-07-18 2008-01-24 Seb S.A. Appareil électronique de pesée
FR2904110A1 (fr) * 2006-07-18 2008-01-25 Seb Sa Appareil electronique de pesee
CN102322999A (zh) * 2010-05-11 2012-01-18 桑德克斯有线有限公司 用于井下负载测量工具的测力计
FR3047144A1 (fr) * 2016-01-28 2017-08-04 Bee Angels Dispositif de controle d’au moins un parametre d’une ruche tel que le poids et une ruche comprenant un tel dispositif de controle
WO2017177189A1 (en) * 2016-04-08 2017-10-12 Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The Uniiversity Of Nevada, Reno Systems and methods for determining snowpack characteristics
US11774634B2 (en) 2016-04-08 2023-10-03 Board Of Regents Of The Nevada System Of Higher Education, On Behalf Of The University Of Nevada, Reno Systems and methods for determining snowpack characteristics
EP4174457A1 (de) * 2022-08-30 2023-05-03 Withings Wiegesystem mit teppichpolstern

Also Published As

Publication number Publication date
EP0984251A3 (de) 2001-04-11
US6417466B2 (en) 2002-07-09
DE69915192T2 (de) 2004-12-16
EP0984251B1 (de) 2004-03-03
DE69915192D1 (de) 2004-04-08
US20020000338A1 (en) 2002-01-03

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